Caracterização de polímeros utilizados como detectores de partículas nucleares: Padc (CR-39) e diallyl phthalate (DAP)

• Autor(a) principal: Pereira, Luiz Augusto Stuani [UNESP]
• Data de Publicação: 2011
• Tipo de documento: Trabalho de conclusão de curso
• Idioma: por
• Título da fonte: Repositório Institucional da UNESP
• Texto Completo: http://hdl.handle.net/11449/149285; http://www.athena.biblioteca.unesp.br/exlibris/bd/capelo/2017-01-23/000875929.pdf
• topic: Fisica; Polímeros; Espectroscopia Raman; Microscopia; Detectores; Physics

The polymers PADC (CR-39) and DiallylPhthalate (DAP), commonly used as solid state nuclear track detectors (SSNTD), were characterized via optical microscopy and Raman and FT-IR spectroscopies in three process: i) without irradiation; ii) as a function of the fluencyof alpha-particle radiation,to the CR-39 detector, and irradiation by induced nuclear fission, to the PAD detector andiii)as a function of the chemical etching time for each of the detectors. The CR-39 detectors were exposed to irradiation with a 226Ra source. On the other hand, the DAP detectors were exposed to fissionable atoms by induction ofthermal neutrons. To reveal thetracks it was used a standard chemical etching for each of the detectors. As for PADC, the chemical etching is 6.25 N NaOH at 70°C for 400 minutes, and for DAP, 15% KOH, 20% water and 65% ethanol at 60°C with a time range from 20 to 30 minutes. Through gradual chemical etching, i.e., decreasing the chemical etching time sequentially, the aim is to study the structure of the latent track (nano-track) without major physical and chemical changes have occurred in the detector. For this purpose, the detectors were analyzed by optical microscopy and Raman and FT-IR spectroscopy. While optical microscopy provides information about morphological changes, the spectroscopic techniques provide information about physical and chemical molecular structure of the detector...